Dyestuffs and their use in photographic material
US4446227A · kind A · utility
1Cited by
3References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 20, 1982 |
| Grant date | May 1, 1984 |
| Priority date | — |
| Expiry date | Sep 20, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The new compounds of the general formula ##STR1## where R.sub.1 is hydrogen, alkyl or cyclic alkyl, R.sub.2 and R.sub.3 are each hydrogen, alkyl, a carboxylic acid, ester or amide group or cyano, and R.sub.4, R.sub.5 and R.sub.6 are each alkyl or aryl, are useful as antihalation dyes and as image dyes in photographic materials for dye-bleaching processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.